Upcoming SlideShare
×

# Circles

2,528 views

Published on

Published in: Spiritual
1 Comment
1 Like
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• nice

Are you sure you want to  Yes  No
Views
Total views
2,528
On SlideShare
0
From Embeds
0
Number of Embeds
7
Actions
Shares
0
66
1
Likes
1
Embeds 0
No embeds

No notes for slide

### Circles

1. 1. Circles By: Javent Erl Cadalso
2. 2. What is circle?  A line forming a closed loop, every point on which is a fixed distance from a center point.  The word "circle" derives from the Greek, kirkos "a circle," from the base ker- which means to turn or bend.
3. 3. Properties of a circle  Center A point inside the circle. All points on the circle are equidistant (same distance) from the center point.
4. 4.  Radius The radius is the distance from the center to any point on the circle. It is half the diameter.  Diameter The distance across the circle. The length of any chord passing through the center. It is twice the radius.
5. 5.  Chord A line segment linking any two points on a circle.  Tangent A line passing a circle and touching it at just one point.
6. 6.  Secant A line that intersects a circle at two points.
7. 7. Formulas of circle in circumference and area  Circumference  Area
8. 8. Exercises 1. Find the circumference of a circle with a diameter of 11 millimeters. 2. Find the diameter of a circle with a circumference of 21.98 meters. 3. Find the area of a circle with a radius of 4 inches. 4. Find the radius of a circle with an area of 200.96 square feet. 5. If the radius of a circle is 1.5 inches, then what is the circumference?
9. 9. How to draw a circle Compass  An instrument containing a magnetized pointer that shows the direction of magnetic north and bearings from it.  An instrument for drawing circles and arcs and measuring distances between points, consisting of two arms linked by a movable joint, one...
10. 10. Use a compass to draw a circle of radius 4 cm. Step 1: Use a ruler to set the distance from the point of the compass to the pencil's lead at 4 cm. Step 2: Place the point of the compass at the centre of the circle. Step 3: Draw the circle by turning the compass through 360º.
11. 11. Exercises 1. Draw a circle with a circumference is 10 mm 2. Draw a circle with a diameter is 20mm 3. Draw a circle with having an area of 12cm squared 4. Draw a circle with a radius of 2mm 5. Draw a circle with having an area of 10mm squared
12. 12. Reference  http://en.wikipedia.org/wiki/Circle  http://www.mathopenref.com/circle.  www.mathsisfun.com/geometry/circle. html  www.math.com/school/subject3/lesson s/S3U1L6GL.html  www.circles.com/
13. 13. Thank you for listening. .